<template>
  <div v-transfer-dom :data-transfer="transfer">
    <transition :name="transitionNames[1]">
      <div :class="maskClasses" :style="wrapStyles" v-show="visible" v-if="showMask" @click="handleMask"></div>
    </transition>
    <div :class="wrapClasses" :style="wrapStyles" @click="handleWrapClick">
      <transition :name="transitionNames[0]" @after-leave="animationFinish">
        <div :class="classes" :style="mainStyles" v-show="visible" @mousedown="handleMousedown">
          <div :class="contentClasses" ref="content" :style="contentStyles" @click="handleClickModal">
            <a :class="[prefixCls + '-close']" v-if="closable" @click="close">
              <slot name="close">
                <Icon type="ios-close"></Icon>
              </slot>
            </a>
            <div :class="[prefixCls + '-header']" @mousedown="handleMoveStart" v-if="showHead">
              <slot name="header">
                <div :class="[prefixCls + '-header-inner']">{{ title }}</div>
              </slot>
            </div>
            <div :class="[prefixCls + '-body']">
              <slot></slot>
            </div>
            <div :class="[prefixCls + '-footer']" v-if="!footerHide">
              <slot name="footer">
                <i-button type="text" @click.native="cancel">{{ localeCancelText }}</i-button>
                <i-button type="primary" :loading="buttonLoading" @click.native="ok">{{ localeOkText }}</i-button>
              </slot>
            </div>
          </div>
        </div>
      </transition>
    </div>
  </div>
</template>
<script>
import Icon from '../icon';
import iButton from '../button/button.vue';
import TransferDom from '../../directives/transfer-dom';
import Locale from '../../mixins/locale';
import Emitter from '../../mixins/emitter';
import ScrollbarMixins from './mixins-scrollbar';

import { on, off } from '../../utils/dom';
import { findComponentsDownward } from '../../utils/assist';

import { transferIndex as modalIndex, transferIncrease as modalIncrease } from '../../utils/transfer-queue';

const prefixCls = 'ivu-modal';

export default {
  name: 'Modal',
  mixins: [Locale, Emitter, ScrollbarMixins],
  components: { Icon, iButton },
  directives: { TransferDom },
  props: {
    value: {
      type: Boolean,
      default: false
    },
    closable: {
      type: Boolean,
      default: true
    },
    maskClosable: {
      type: Boolean,
      default() {
        return !this.$IVIEW || this.$IVIEW.modal.maskClosable === '' ? true : this.$IVIEW.modal.maskClosable;
      }
    },
    title: {
      type: String
    },
    width: {
      type: [Number, String],
      default: 520
    },
    okText: {
      type: String
    },
    cancelText: {
      type: String
    },
    loading: {
      type: Boolean,
      default: false
    },
    styles: {
      type: Object,
      default() {
        return {};
      }
    },
    className: {
      type: String
    },
    // for instance
    footerHide: {
      type: Boolean,
      default: false
    },
    scrollable: {
      type: Boolean,
      default: false
    },
    transitionNames: {
      type: Array,
      default() {
        return ['ease', 'fade'];
      }
    },
    transfer: {
      type: Boolean,
      default() {
        return !this.$IVIEW || this.$IVIEW.transfer === '' ? true : this.$IVIEW.transfer;
      }
    },
    fullscreen: {
      type: Boolean,
      default: false
    },
    mask: {
      type: Boolean,
      default: true
    },
    draggable: {
      type: Boolean,
      default: false
    },
    zIndex: {
      type: Number,
      default: 1000
    }
  },
  data() {
    return {
      prefixCls: prefixCls,
      wrapShow: false,
      showHead: true,
      buttonLoading: false,
      visible: this.value,
      dragData: {
        x: null,
        y: null,
        dragX: null,
        dragY: null,
        dragging: false
      },
      modalIndex: this.handleGetModalIndex(), // for Esc close the top modal
      isMouseTriggerIn: false // #5800
    };
  },
  computed: {
    wrapClasses() {
      return [
        `${prefixCls}-wrap`,
        {
          [`${prefixCls}-hidden`]: !this.wrapShow,
          [`${this.className}`]: !!this.className,
          [`${prefixCls}-no-mask`]: !this.showMask
        }
      ];
    },
    wrapStyles() {
      return {
        zIndex: this.modalIndex + this.zIndex
      };
    },
    maskClasses() {
      return `${prefixCls}-mask`;
    },
    classes() {
      return [
        `${prefixCls}`,
        {
          [`${prefixCls}-fullscreen`]: this.fullscreen,
          [`${prefixCls}-fullscreen-no-header`]: this.fullscreen && !this.showHead,
          [`${prefixCls}-fullscreen-no-footer`]: this.fullscreen && this.footerHide
        }
      ];
    },
    contentClasses() {
      return [
        `${prefixCls}-content`,
        {
          [`${prefixCls}-content-no-mask`]: !this.showMask,
          [`${prefixCls}-content-drag`]: this.draggable,
          [`${prefixCls}-content-dragging`]: this.draggable && this.dragData.dragging
        }
      ];
    },
    mainStyles() {
      let style = {};

      const width = parseInt(this.width);
      const styleWidth =
        this.dragData.x !== null
          ? {
              top: 0
            }
          : {
              width: width <= 100 ? `${width}%` : `${width}px`
            };

      const customStyle = this.styles ? this.styles : {};

      Object.assign(style, styleWidth, customStyle);

      return style;
    },
    contentStyles() {
      let style = {};

      if (this.draggable) {
        const customTop = this.styles.top ? parseFloat(this.styles.top) : 0;
        const customLeft = this.styles.left ? parseFloat(this.styles.left) : 0;
        if (this.dragData.x !== null) style.left = `${this.dragData.x - customLeft}px`;
        if (this.dragData.y !== null) style.top = `${this.dragData.y}px`;
        if (this.dragData.y !== null) style.top = `${this.dragData.y - customTop}px`;

        const width = parseInt(this.width);
        const styleWidth = {
          width: width <= 100 ? `${width}%` : `${width}px`
        };

        Object.assign(style, styleWidth);
      }

      return style;
    },
    localeOkText() {
      if (this.okText === undefined) {
        return this.t('i.modal.okText');
      } else {
        return this.okText;
      }
    },
    localeCancelText() {
      if (this.cancelText === undefined) {
        return this.t('i.modal.cancelText');
      } else {
        return this.cancelText;
      }
    },
    showMask() {
      return this.draggable ? false : this.mask;
    }
  },
  methods: {
    close() {
      this.visible = false;
      this.$emit('input', false);
      this.$emit('on-cancel');
    },
    handleMask() {
      if (this.maskClosable && this.showMask) {
        this.close();
      }
    },
    handleWrapClick(event) {
      if (this.isMouseTriggerIn) {
        this.isMouseTriggerIn = false;
        return;
      }
      // use indexOf,do not use === ,because ivu-modal-wrap can have other custom className
      const className = event.target.getAttribute('class');
      if (className && className.indexOf(`${prefixCls}-wrap`) > -1) this.handleMask();
    },
    handleMousedown() {
      this.isMouseTriggerIn = true;
    },
    cancel() {
      this.close();
    },
    ok() {
      if (this.loading) {
        this.buttonLoading = true;
      } else {
        this.visible = false;
        this.$emit('input', false);
      }
      this.$emit('on-ok');
    },
    EscClose(e) {
      if (this.visible && this.closable) {
        if (e.keyCode === 27) {
          const $Modals = findComponentsDownward(this.$root, 'Modal').filter(item => item.$data.visible && item.$props.closable);

          const $TopModal = $Modals.sort((a, b) => {
            return a.$data.modalIndex < b.$data.modalIndex ? 1 : -1;
          })[0];

          setTimeout(() => {
            $TopModal.close();
          }, 0);
        }
      }
    },
    animationFinish() {
      this.$emit('on-hidden');
    },
    handleMoveStart(event) {
      if (!this.draggable) return false;

      const $content = this.$refs.content;
      const rect = $content.getBoundingClientRect();
      this.dragData.x = rect.x || rect.left;
      this.dragData.y = rect.y || rect.top;

      const distance = {
        x: event.clientX,
        y: event.clientY
      };

      this.dragData.dragX = distance.x;
      this.dragData.dragY = distance.y;

      this.dragData.dragging = true;

      on(window, 'mousemove', this.handleMoveMove);
      on(window, 'mouseup', this.handleMoveEnd);
    },
    handleMoveMove(event) {
      if (!this.dragData.dragging) return false;

      const distance = {
        x: event.clientX,
        y: event.clientY
      };

      const diff_distance = {
        x: distance.x - this.dragData.dragX,
        y: distance.y - this.dragData.dragY
      };

      this.dragData.x += diff_distance.x;
      this.dragData.y += diff_distance.y;

      this.dragData.dragX = distance.x;
      this.dragData.dragY = distance.y;
    },
    handleMoveEnd() {
      this.dragData.dragging = false;
      off(window, 'mousemove', this.handleMoveMove);
      off(window, 'mouseup', this.handleMoveEnd);
    },
    handleGetModalIndex() {
      modalIncrease();
      return modalIndex;
    },
    handleClickModal() {
      if (this.draggable) {
        this.modalIndex = this.handleGetModalIndex();
      }
    }
  },
  mounted() {
    if (this.visible) {
      this.wrapShow = true;
    }

    let showHead = true;

    if (this.$slots.header === undefined && !this.title) {
      showHead = false;
    }

    this.showHead = showHead;

    // ESC close
    document.addEventListener('keydown', this.EscClose);
  },
  beforeDestroy() {
    document.removeEventListener('keydown', this.EscClose);
    this.removeScrollEffect();
  },
  watch: {
    value(val) {
      this.visible = val;
    },
    visible(val) {
      if (val === false) {
        this.buttonLoading = false;
        this.timer = setTimeout(() => {
          this.wrapShow = false;
          this.removeScrollEffect();
        }, 300);
      } else {
        this.modalIndex = this.handleGetModalIndex();

        if (this.timer) clearTimeout(this.timer);
        this.wrapShow = true;
        if (!this.scrollable) {
          this.addScrollEffect();
        }
      }
      this.broadcast('Table', 'on-visible-change', val);
      this.broadcast('Slider', 'on-visible-change', val); // #2852
      this.$emit('on-visible-change', val);
    },
    loading(val) {
      if (!val) {
        this.buttonLoading = false;
      }
    },
    scrollable(val) {
      if (!val) {
        this.addScrollEffect();
      } else {
        this.removeScrollEffect();
      }
    },
    title(val) {
      if (this.$slots.header === undefined) {
        this.showHead = !!val;
      }
    }
  }
};
</script>
